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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '791ec57c9910791e88c2f86ffe87ff5ca5f00860f125e54c802741f4ed2a2f1f' 
  AND token = '5u+EA9zYvw9IB4zabrvk9QJBq1vT3RBbhp5boRVByoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}